Revised Stormwater Management Report

POA 1 proposed 2024-05-12 HydroCad - Proposed POA 1 NOAA 24-hr D 10-Year Rainfall=5.22" Prepared by Anderson Consulting Services Printed 6/29/2024 Page 32 HydroCAD® 10.20-5a s/n 06666 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 14S: Basin 1 - Imp Runoff = 3.29 cfs @ 12.21 hrs, Volume= Routed to Pond 16P : Basin 1 15,518 cf, Depth= 4.98" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs NOAA 24-hr D 10-Year Rainfall=5.22" Area (sf) 8,944 28,428 37,372 37,372 Tc (min) 9.0 Length (feet) 59 1.7 425 3.4 14.1 516 1,000 CN 98 98 98 Description Paved parking, HSG D Paved parking, HSG C Weighted Average 100.00% Impervious Area Slope Velocity Capacity Description (ft/ft) (ft/sec) (cfs) 0.0200 0.11 Sheet Flow, Sheet Flow (A-B) Grass: Dense n= 0.240 P2= 3.47" Using McCuen-Spiess flow length 0.0650 4.10 Shallow Concentrated Flow, SCF (B-C) Unpaved Kv= 16.1 fps 2.50 Direct Entry, Pipe Flow (C-D) Total Subcatchment 14S: Basin 1 - Imp Hydrograph Runoff 3.29 cfs Flow (cfs) 3 2 1 0 0 2 4 NOAA 24-hr D 10-Year Rainfall=5.22" Runoff Area=37,372 sf Runoff Volume=15,518 cf Runoff Depth=4.98" Flow Length=1,000' Tc=14.1 min CN=98 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72 Time (hours)